Add setMessage method to IRCMessageEent.

src/main/java/com/cnaude/purpleirc/Events/IRCMessageEvent.java

@@ -27,7 +27,7 @@
 public class IRCMessageEvent extends Event {
 
     private static final HandlerList HANDLERS = new HandlerList();
-    private final String message;
+    private String message;
     private final String permission;
 
     /**
@@ -72,4 +72,13 @@ public HandlerList getHandlers() {
     public static HandlerList getHandlerList() {
         return HANDLERS;
     }
+
+    /**
+     * Change the IRC message being sent to the game
+     *
+     * @param message the message from IRC
+     */
+    public void setMessage(String message) {
+        this.message = message;
+    }
 }